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Fans always running at full speed

Last response: in Components
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June 21, 2012 9:52:35 AM

I have 2 Cooler Master R4 fans cooling my dual 120mm radiator at the top of my case. One of these is connected to the CPU fan header on the motherboard while the other one is connected to the pwr_fan header (since I have no more fan headers left). However, both of these fans are running at 1,800+ RPM (they are rated for 2,000rpm) even when the system is idle. I have tried going into the BIOS to change the fan speeds but the ASUS Qfan control does not seem to have any options for this. SpeedFan also only works for my rear chassis case and not my rad fans for some reason. Is there any way to make these fans run at a slower or quieter setting?
June 21, 2012 10:00:26 AM

The Cooler Master R4 fans have a 3 pin connector, hence their fan speed cannot be controlled via Motherboard/BIOS.
You'd have to invest in a fan controller.
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June 21, 2012 10:16:31 AM

I thought that 3 pin fans can still be controlled by limiting the voltage that they receive while 4 pin fans use PWM control.
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June 21, 2012 12:40:48 PM

AFAIK, only PWM fans can be controlled through BIOS.
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June 21, 2012 1:13:54 PM

Then how come my R4 fan that I use to exhaust air out the back of my case can be controlled through SpeedFan?
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June 21, 2012 2:14:43 PM

I can only control my rear fan with SpeedFan, none of the other fans respond to it.
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June 21, 2012 2:55:20 PM

So if I disable BIOS fan control, SpeedFan will work for all the fans?
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